Compression refrigerating machine



Mrch 18, 1941.

W. HIRCHE COMPRESSION REFRIGERATING MACHINE Filed Sept. 4, 1936 ipa..

A.; www

Patented Mar. 18, 1941 comaE'ssIoN aarmenaa'rmdmcmnu Willy Hirche, Leopoldshain, Germany Application september 4, 193s, sei-iai No. 99,436 In Germany September 24, 1935 s claims. (ci. sz-'115).

In refrigerating machines with compressor the oil must be conducted to the Amoving parts, yet prevented from accumulating in the system. According to the invention the circulation of the ,5 oil is regulated by a collector chamber formed on the evaporator. Ihe oil collects in this container and is'circulated through the system in freely distributed state with the refrigerant, in such a manner that the moving parts receive ample 10 lubrication but no oil can accumulate in the sys? tem.

- The refrigerant laden with lubricant is sucked Y into the crank case by the compressor and then forced to the condenser and back to the evaporal5 tor where the lubricant separates from the reirigerant by gravity before being again circulated through the system. A s the' crank case and the evaporator are directly connectedby the feed pipe for the refrigerant the pressure in the so crank case is the same as that in the evaporator.

An embodiment 'of the invention is illustrated by way of example in the only figure of the accompanying drawing.

` The compressor comprises a crank case 2` with 2liv cylinder i extending therefrom. A piston 6 re.-

ciprocates in this cylinder .l and has in its head a suction valve 5 adapted to establish communication between the space 3 of the cylinder and the crank case 2 during the suction. stroke 3o of the piston S. The cylinder space 3 is closed by a pressure valve B.

A feed pipe I communicates with the crank case 2 and a delivery pipe i3 extends from the cylinder space 3 below the-pressurelvalve I,

3s The delivery pipe I3 extends to a condenser il from which a pipe i5 leads to .an evaporator 8 tllled with liquid refrigerantan expansion valve i8 being arranged between the end of the pipe I5 and the evaporator 8. The evaporator is enlarged 45 at its upper end to form a collector chamber iii and the feed pipe l 'extends into this chamber. A layer of lubricant floats on` the top of the reirigerant in the chamber l and ,the-end Il of 'the feel pipe 1 isbent upwards so that its ex- 5 tremity is above the level of the oil 8 in the chamber 8B, holes l2 being provided in the pipe end il below the layer of the oil.9 floating on the lubricant,

During the downward stroke of the piston 6 o in the cylinder i refrigerant'and oil are drawn into the crank case 2,through the pipe 1 from the chamber i0 of the evaporator 8. v

During the return or upward strokerof the piston 6 the pressure valve 4 closes and the sucs tion valve 5 in the piston opens under the suction produced in the cylinder space I, thus the refrigerant laden with lubricant previously drawn into the crank case 2 passe'sthrough the valve 5 into the cylinder space 3. v

When the piston I again descends the valve 5 s closes and the refrigerant is compressed in the space -3 until the pressure valve! yields and allows it to passout through the-delivery pipe i3 to the condenser il and thence to the evaporator through the pipe I5 and throttle cock I6. l0 The lubricant passes with the refrigerant through the crank case and cylinder; it lubricates these parts but has no opportunity of collecting anywhere. On being returned to the evaporator it automatically separates therefrom and 'doats to the surface thereof owing toits lighter specic weight.

Thus lthe lubricant is continually 4circulated through the system with the refrigerant and all moving parts receive ample lubrication. 20

I claim: v

l. A compression refrigerating machine with oil circulatiox., comprising in combination a compressor, a condenser, an evaporator and an expansion valve located in a plane entirely below v the compressor and condenser and connected diyrectly to`the condenser, said compressor being of such construction whereby oil unrestrictedly flows therethrough, a single oil collecting chamber in the machine located in said evaporator iii)- at the upper end thereof and adapted to collect all the `oil in circulation in the machine, and a common conduit between said compressor, kcondenser, evaporator and expansion valveadapted' to convey the oil with the refrigerant ythrough said compressor, condenser and expansion valve to said evaporator.

2. A compression refrigerating machine with oilcirculation. comprising in combination a compressor, acondenser, an evaporator and an ex- 40' pansion valve located in a plane entirely below the compressor'and condenser and connected directly to thecondenser, said compressor being of such construction wherebyV oil unrestrictedly. flows therethrough, a single oil collecting cham 45 ber in the machine located at the upper endl of said evaporator in the direction of iiow .of the refrigerant and adapted to collect all the oil in circulation inthe machine, and a' common conduit between said compressor, condenser, evap- 50,

orator and expansion valve adapted to convey the oil with the refrigerant through said compressor, condenser and' expansion valve to said evaporator.

3. In a compression refrigerating machine in 2 anaasia said casing, said compressor casing having an inlet above said crank gear, the oil being admitted with the refrigerant vapors into said crank case .through said inlet to lubricate said gear and be' ing immediately sucked on from said crank case 5 with the refrigerant vapors.

4wrnrsrlirrtcnn. 

